174/365 Office space

I work from home and have half the attic for my office. Dean has an office at work, an office in the finished basement and the other half the attic for another office. His offices are off-limits to me and my stuff. If I do a clean of my attic, I cannot put anything on his side of the attic or he will be all “what’s this? get it out of here” or he just plops it on my side again. He has 3 places to call his own. I have one and it pisses me off.